25 if an atom has 19 protons and 20 neutrons, what is the atomic number? a 19 b 1 c 20 d 39
25 if an atom has 19 protons and 20 neutrons, what is the atomic number? a 19 b 1 c 20 d 39
Answer
Explanation:
Step1: Recall atomic number definition
The atomic number of an atom is equal to the number of protons in its nucleus.
Step2: Identify number of protons
The atom has 19 protons.
Answer:
A. 19